| 摘要 |
<p>The invention concerns agglomerated zeolitic adsorbents based on zeolite X with Si/Al ratio such that 1.15 < Si/Al ≤ 1.5 whereof at least 90 % of the exchangeable cationic sites of the zeolite X are occupied either by barium ions alone or by barium ions and potassium ions and inert binder, whereof the Dubinin volume is not less than 0.240 cm3/g. Said adsorbents can be obtained by agglomerating zeolite powder with a binder followed by zeolitization of the binder, exchanging zeolite ions with barium (and potassium) ions and activating the resulting exchanged adsorbents. Said adsorbents are particularly suitable for adsorbing paraxylene contained in C¿8? aromatic hydrocarbon cuts in liquid phase in processes of the simulated mobile bed type but also for separating sugars, polyhydric alcohols, cresols, substituted toluene isomers.</p> |
